Close-up synthetic aperture sonar image of the bow section of the USS Murphy, showing entangled fishing gear. This type of bottom dredge is commonly used in the commercial bottom fishing industry for scallops, oysters, clams, and other bottom-dwelling species. The front part of these dredges are typically made of a metal towing bail that is weighed down, seen here caught on the bow of the Murphy. The dredge is dragged along the seafloor and is attached to a series of chains and nets to mobilize and hold the catch.